Fluid-pressure lifting-jack.



1. M. MEYERS.

FLUID PRESSURE LIFTING JACK.

APPLICATION FILED APR. 23, 1913. Y

' l Patented Apr. 24, 1917.

2 SHEETS-SHEET I.

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WITNESSES /7 III/I. IvIEYEIIs. FLUID PRESSURE LIFTING JACK.

1,223,712; APPLICATION FILED APII. 23. 1913. Patented Apr. 24,1917.

2 sIIEns-sIIEEI 2.

v NVENTOR Attorney WITNESSES limit of extension,

ia"y .aras partum mama.

JOHN MAX MEYERS, 0F WEST CHESTER, PENNSYLVANIA.

FLUID-PRESSURE LIFTING-JAGK.

Application filed April 23, 1913.

To all 'whom t may con-cem:

Be it known that I, JOHN MAX MEYERS, a citizen of the United States, residing at West Chester, in the county of Chester and State of Pennsylvania, have invented certain newand useful Improvements in Fluid- Pressure Lifting-Jacks, of which the following is a specification. d

My invention relates to fluid pressure lifting jacks, and the object thereof is to provide a compact, simple and inexpensive construction of jack of this character that will be suitable as a part of an automobile equipment by reason of containing in storage within the jack of a supply of compressed air or other fluid, so controlled as'to adapt the jack for repeated operations until the pressure supply is exhausted.

My invention also has for a further objectva provision of means by which the jack will be made effective in its application to bodies under which it is impracticable to insert the jack, and also to provide elfective means by which the jack can be expeditiously and securely attached to the axle of an automobile and other objects so as to prevent the occurrence of any accidental slipping of the jack from under the same. My invention has further provision for rendering safe the operation of the jack.

My .invention primarily consists in the combination of a casing, therefor, said plunger having an air-tight chamber for the storage of compressed air or other luid'and having suitably controlled communication between saidy chamber and the plunger space of the casing, whereby the compressed fluid discharging therein will cause relative movement between the casing.

and the plunger to effect lifting.

My invention further consists in certain other novel features in the construction and arrangement of parts, all as hereinafter described and as specically set forth in the appended claims.

In the accompanying drawings, y

Figure 1 is a longitudinal cross section taken through the jack on the line 3--3 of Fi 3.

, Fig. 2 shows a longitudinal cross section, as in Fig. 1, but showingl the jack at its the jack beingV shown with a portion broken away.

Fig. 3 is a top view of the jack. Fig. 4 is a bottom view of the base ofthe Specification of Letters Patent.

with a plunger Patented Apr. 241, 1917. Serial No. 763,132.

jack without the base board shown in Figs. 1 and 2.

Fig. 5 is a detail showing a cross section taken through the discharge pipe and through the valve controlling eccentric at right angles to the stem carrying the eccentric.

Fig. 6 is a 6`6 of Fig. 5.

Fig. 7 is a detail showing the packingof the vplunger element and clamping block `in elevation, with a portion of the packing broken away. y

Referring to the drawings', 8 indicates a cylindrical casing or shell open at one eI'ld, being formed with a base flange 9 of rectangular form which is provided with calks 9a on the under side thereof at each corner to insure a space underneath the casing open to the air. These calks are preferably serhorizontal section on the line rated'on their under surface and as shown rest upon a base 10 of t0 the base of the casing by screws or otherwise. v

The bottom of the casing 8 is formed'with a central opening 11 therethrough and provided with. a countersunk gasket 12 of rub-- ber or other yielding material surrounding c the opening, and forming a seat for an internal valve disk 13 constituting a release valve, as will more fully appear hereinafter. The valve disk 13 is concaved on its under face and presents a peripheral bearing face on which is formed two annular rings 14 which find a secure seat in the yielding gasket. The valve disk is cast with a cage 15 into which the valve operating stem 16 extends wood which is secured and is held therein by the head or button 17 I tion or head 19 having a raised bearing ring 20 with a knurled surface, for securely engaging the jack with the object being lifted.

lVithin the outer head of the tank is a radialv bore 21, shown in dotted lines, Fig. 3, and opening directly therefrom into the tank for the purpose of lcharging the same,

a screw threaded nozzle 22 lbeing provided for attachment to a pump or other source of 'disk is {irml'y clamped.

of the clamping vthe tank to this central tube 24. The bore I Extending up into y ycompressed provided with a check valve 23 of any well 24 is a side port 40 air supply, the nozzle being knownform to automatically close it by the internal pressure.

For the discharge of the compressed air from the tank into the casing below the tank there is piovidedal main centrally locatedf tubey 24 extending from the outer head 19 of theman tank and through the lower` head 25 into which heads the 'threadedportions of the tube are screwed. This tube is closed at the top is removed tb insert the valve stem 16 within same, and its`v threaded lower end portion extends 'slightly below the head 25 to receive a packing disk 27 of leather or other suitable material and a circularblock 28 be-4 tweenj which and the head 25 the packing The block. 28 lis slightly smaller in diameter than the head .25, while the packing disk is much larger,

being designed to have a peripheral portion turned down against the clamping block. In order that the compressed air admitted to the casing below the tank will act of itself to evenly press the packing against the casing walls a series of grooves 29 have been formed. around the periphery block with intersecting connecting grooves 30iin staggered arrangement, so that the compressed air will be communicated uniformly throughout the grooves'to create an equal pressure on all parts of the yinner surface of the packing to force thesame against the casing.

In the upper threaded part pf the tube rvadial passage or .19 toits periphery, which bore isl intersected by a vertical bore 33 made through the head, thus forming a passage fromqthe interior of 33 receives a threaded valve tube 34 extending within the interior of the tank and inserted through the head, the bore opening 'therein being closed by a screw plug. The

opening through the valve tube 34 is increased in diameter to form a valve recess for the ball 35 and'seating spring 36 confined therein' bya vperforated screw plug 37.

with the ball 3 5 flattened lsides. l radial bore 32 is a screw threaded stutiing is a push pin 38, with box bearing 39 for a rotary stem 4 O'located '.'on the end of within the bore and carrying an eccentric 41 for'depressing' the pin 38 by cam action said pin when the. ste is 'partially rotated bythe handle 42.` As shown in the several figures of the drawing this .handle is in its raised eccentric depressing the push pin to its limit of movement, thus opening the ball valve bya screw plug v26 which 31 which registers with a bore 32 made in the head lessly or suddenly compressed air from the tube 34 into contact Within the end -of the position with the,

and `allowing the tank to discharge compressed air through flattened sides of the pin, into the recess to the central tube 24, which -will cause the raising of the tank or plunger. portion 'of the jack. To relieve the pressure graduall normal position on the annular support 43, the rotary stem 40 is formed with a passage 44 extending through the same, which passage is closed by the ball 445 under the seating action of the agent. The ball may be readily held away from its seat bythe push button 47 which carries a pin 48 extending within thev valve spring 4,6 and the pressureA the valve tube along the Y., and allow the tank portion to descend to its outlet. This button has a guiding extension or stop rod 49 working'through of the handle, which prevents the button from being operated 'by reason of theengagement of the end .of said extension or rod with the tank, as at 51, but when the handle is down or in action is such as to above the tank, free with, and thus permitting the operation of the closed position the bring said extension of engagement there.

the push button only when the compressed air of the tank has been'jurned ofi and thereby preventing any opening of the re. f

lease valve while the compressed air is dis-` charging. In order to automatically cut oft' the supply of compressed air to the interior of the casing, thus preventing an over expenditure of the pressure fluid, the valve stem 16 is provided with a conical head 52 which works within the enlarged portion ofthe bore of` the tube 24 and rests within "the I the'jack-has reachedits Fig..

conical seat 53 when v proper limit of extension, as shown in 2, but in the eventthat the pressure is careshoiild be accidentally relieved of itsload, the expansion of the fluid will in raising the tank element beyond the point illustrated thereby yieldingly retarding any action and permitting the escape o below initially seated by the of the coil sprii'ig 54 This latter valve is compressing action` introduced or the jack against theclamping block 28, so that when the vcompressed air is introduced itwill not d escape andllift the valve'.

'In vorder to adapt the jackfor operation where/.it cannotbe placed beneath the-objectt be raised, a chain 55. or other lexible supportingmeans is attached to the raising member of the 'jack and preferably within the slotted extension 19al of the head 19, by a pin 56, and is designed to be looped around an object such as an axle, and

caught as shown within the slot 57 which snugly receives. the narrow part of the link,

- or it may be-looped up asshown. lin'dotted 15 vber for the storage of .or other fluid, extending lines with a terminal hook 58 engaging one of the links. To employ the chain for the binding of the jack securely to the object being lifted, as for instance an axle, such 4being shown in dotted lines, the links of the chain are inserted lover a stud 59 located opposite` the permanent point of attachment.

I realize that considerable variation is possible inthe details of construction and arrangement of parts without departing from the spirit of my invention and therefore do not limit myself to the specific form shown and described.

What I claim and desire to secure by Letters Patent, is; Y

l. A fluid pressure jack, comprising a casing, and a plunger working within said casing, said plunger having an air tight chamcompressed air or other fluid, and having controlled communication between said chamber and the plunger space of the casing.

2. A fluid pressure jack, comprising a casing, and a tank for the storage of compressed air or other Huid, telescoping within said casing, adapted to provide a bearing at its outer end, and having controlled communication with the space between said tank and the closed end of the casing.

3. A fluid pressure jack, comprising a casing, a tank for the storage of compressed air within said casing, said tank having controlled communication with the space between it and the closed end of the casing, and a packing carried by said v tank for sealing the space between the walls of the tank and casing. l

4. A fluid pressure jack, comprising a casing, a tank for the storage of compressed air or other fluid, extending within said casing,

said tank having controlled communication/' with the space between said tank and the closed end of the casing, and a packing carried by said tank, said tank being provided beneath said packing with a series of circumferential grooves having cross connecting grooves in open relation with the compressed air space-of the casing.

5. A fluid pressure jack, comprising a casing, a plunger working within said casing, one of said elements having a chamber for the storage of compressed air or other fluid and having controlled communication between said storage chamber and the plunger space of the casing, and a release valve in said casing controlled by therelative movement of the plunger and casing upon reaching a predetermined point of' movement.

6. A fluid pressure jack, comprising a casing and a plunger working within said casing, said plunger having a chamber for the storage of compressed air or other fluid and having communication between said storage chamber and the plunger space ofthe casing, and means for closing said communicacasing,

tion upon the plunger reaching a predetermined point of movement with relation to the casing.

7. A-uid pressure jack, comprisinga casing, a plunger. working within said casing, one of said elements having a chamber for the storage of compressed and having controlled communication between said storage chamber and the plunger space of the casing, and a release valve in said casing having a stem adapted to be engaged by the said plunger to cause the lifting of the valve at a predetermined point of the relative movement of casing.

8. A fluid pressure jack, comprising a casing, a plunger working within said casing, said plunger having a chamber for the storage of compressed air or otherfluid, and having communication between said storage chamber and the plunger space of the casing, a valve for manually controlling the discharge of the pressure Huid through said communication, and a valve for closing said communication automatically upon the relative movement of the plunger and casing upon reaching a predetermined point in their movement.

9. A fluid pressure ack, ing, and a tank for the storage of compressed air or other fluid, working within said casing, said tank having within the same a` tubular passage extending longitudinally thereof and having one end in open comprising a casrelation to the interior of the casing, a bore connecting said tube with the interior of the tank, a valve in said bore, andmeans for opera ting said valve.

10. A fluid pressure jack, comprising a and a tank for the storage of compressed air or other fluid, working within said casing, said tank having within the same a tubular passage extending longitudinally thereof and having one end in open relation to the interior of the casing, a bore connecting said tube with the interior of the tank, a valve in said bore, and a rotary stem 'carrying an eccentric for operating said valve.

1l. A fluid pressure casing, and a tank for pressed air or other fluid, Working within said casing, said tank having within the same a tubular passage extending longitudinally thereof and having one end in open relation to the interior of the casing, a valve controlling the discharge 'of the pressure agent into said passage, a rotary stem having an eccentric for operating said valve, and a push pin interposed between said valve and said eccentric. v

l2. A fluid pressure casing, and a tank for jack, lcomprising ajack, comprising a the storage of com- -pressed air or other fluid, working within sald casing, said tank having within the the plunger and the storage of comclosed valve in said passage,

with the interiorof the casing 25 same a` passage connecting said tank With the interior of the casing, a valve controlling the discharge of the pressure agent into said A.

passage, a rotary stem having 'an eccentric for -operating said valve, and a valved release passage through said stem.

13. A fluid pressure jack, comprising a casing, andl a tank for the storage of -compressed air or other iuid, Working Within said casing, said tank having communication with the interior of the casing and beneath the tank, a valve normally closing said communication, means for opening said valve, a release passage for conducting the compressed air from the casing, a normally closed valve in saidi passage,l and means for opening said latter valve, said means being adapted to lock against operating When the first-mentioned valve is in open position.

1&1. A vfluid. pressure jack, comprising a casing, and a tank for the storage of compressed air or other fluid, Working Within said casing, said tank having communication beneath the tank, a valve normally closing said commu# nication, means for opening said valve, a release passage forconducting the compressed air Lfrom the casing, a normally closed valve in said passage, and an operating push button therefor-locked against operation by the opening of the valve controlling the ,discharge fromsaid tank.

15.- A fluid pressure jack, comprising a casing, and a tank for the storage of compressed air or other fluid, -Working Within saidfcasing, said tank having communication with the interiorof the casing beneath the tank, a valve'normally closing said communication, va rotary stem for opening said valve, a release passage for conducting. the compressed air from the casing, a normally ing ypush button therefor carried 'by the said rotary stem and having a' stop adapted to engage the tank Whenjthe saidstem isiin the open position.

pressed said casing,

and an operat- 16. A iiuid pressure jack, compris'ng a casing, and a tank for the storage of comair or other fluid, Working Within said tank having 'within the same a tubular passage extending longitudi-l nally thereof and having one end in open relation to the interior of the casing, and the said casing having a stem extending Within the said passage and having a valve adapted to seat Within the same at a predetermined point of the raising movement of the tank.

17. A fluid pressure jack, comprising a casing, and a tank for the storage of compressed air or other fluidyvvorking Within said casing, said tank having Within the same a tubular passage extending longitudinally thereof and having one end in open relation to the interior of the casing, and the said casing' having a valve in its base, a` stem connected to Said valve, extending Within the" said tubular passage and adapted to be engaged at a predetermined point of the raising movement of the tank to operate said valve and release the compressed air'from the casing.`

18. A fluid ypressure casing, and a tank for pressed air or other jack,'comprising a the' storage of com? fluid, yWorking within `said casing, y said tankehaving Within the same a tubular passage extending longitudinally thereof and havin one end in open re lation to the interior o the casing, and the said casing having a valve in its base, a stem connected to said valve having a 'vertical play independent of the valve, said stem eX- tending withinthe said tubular passage and carrying a valve adapted toseat therein at a predetermined point of the raising movement of the tank.

In testimony whereof I affix my signature in presence ofl twowvitnesses.

l y y JOHN MAX MEYERS. Witnesses: i

- GEO. MGFA'RLAND,

CHARLES R. PALMER. 

